Results 11 to 20 of about 52 (51)

Conditions for Energetic Electrons and Gamma Rays in Thunderstorm Ground Enhancements

Journal of Geophysical Research: Atmospheres, Volume 128, Issue 24, 27 December 2023., 2023
Abstract The role of free passage distance (FPD: the distance between the avalanche region and surface detectors) in influencing the relative numbers of energetic electrons and gamma rays in Thunderstorm Ground Enhancements (TGEs) is reconsidered and focuses on the contrast between long (>100 m) versus short (<100 m) FPDs, respectively.
E. Williams, B. Mailyan, G. Karapetyan, H. Mkrtchyan   +3 more
wiley   +1 more source

Adapting a practical EPR dosimetry protocol to measure output factors in small fields with alanine

Journal of Applied Clinical Medical Physics, Volume 24, Issue 12, December 2023., 2023
Abstract Purpose Modern radiotherapy techniques often deliver small radiation fields. In this work, a practical Electron Paramagnetic Resonance (EPR) dosimetry protocol is adapted and applied to measure output factors (OF) in small fields of a 6 MV radiotherapy system.
Sebastian Höfel, Pauline Liebig, Michael K. Fix, Malte Drescher, Felix Zwicker   +4 more
wiley   +1 more source

Accuracy and reliability of a commercial treatment planning system in nontarget regions in modern prostate radiotherapy

Journal of Applied Clinical Medical Physics, Volume 24, Issue 8, August 2023., 2023
Abstract Background The currently available treatment planning systems (TPSs) are neither designed nor intended for accurate dose calculations in nontarget regions. The aim of this work is to quantify the accuracy and reliability of nontarget doses calculated by a commercially available TPS. Methods Nontarget doses calculated by the collapsed cone (CC)
Willeke Danckaert, Piet Ost, Carlos De Wagter   +2 more
wiley   +1 more source

Conditions for Inception of Relativistic Runaway Discharges in Air

Geophysical Research Letters, Volume 50, Issue 7, 16 April 2023., 2023
Abstract Terrestrial gamma‐ray flashes are linked to growth of long bidirectional lightning leader system consisting of positive and stepping negative leaders. The spatial extent of streamer zones of a typical lightning leader with tip potential exceeding several tens of megavolts is on the order of 10–100 m.
Victor P. Pasko, Sebastien Celestin, Anne Bourdon, Reza Janalizadeh, Jaroslav Jansky   +4 more
wiley   +1 more source

The road toward imaging a black hole: A personal perspective

Natural Sciences, Volume 2, Issue 4, October 2022., 2022
The article describes the authors personal journey towards developig the Event Horizon Telescope and the first image of a black hole. Left: predcition made by the author and collaborators proposing the black hole imaging in 2000. Right: the two images observed and published by the Event Horizon Telescope in 2019 and 2022.
Heino Falcke
wiley   +1 more source

Second‐Harmonic Hyper‐Mie Optical Activity Enables Closed‐Loop Chiral Photochemistry

Advanced Materials, Volume 38, Issue 40, 17 July 2026.
Nonlinear chiral photochemistry is demonstrated in CdTe/CdO nanohelices, where circularly polarized infrared light both drives and tracks photo‐oxidation via second‐harmonic scattering. This closed‐loop process reveals real‐time structural evolution, including shell fracturing and core exposure, accompanied by a transition from hyper‐Mie to hyper ...
Hoyeon Choi, Kody Whisnant, Ben J. Olohan, E. Petronijevic, G. Dan Pantoș, Nicholas A. Kotov, Ventsislav K. Valev   +6 more
wiley   +1 more source

Work Versus Force: Simultaneous Processes for Describing Interactions

Advanced Physics Research, Volume 5, Issue 6, June 2026.
ABSTRACT Achieving a unified description of interactions remains an open challenge in theoretical physics, which currently describes four fundamental forces. This situation may be viewed differently when interactions are formulated in terms of processes (work as actio) rather than forces (force as actio), not only at the macroscopic level but also at ...
Grit Kalies, Duong D. Do, Cornelia Breitkopf   +2 more
wiley   +1 more source

Electrons and X‐rays for diffraction and imaging

Acta Crystallographica Section D, Volume 82, Issue 5, Page 446-456, May 2026.
The use of X‐rays and electrons for diffraction and imaging of soft biological samples is compared.A comparison is provided between the use of electrons and X‐rays for collecting diffraction data from small protein crystals and imaging data from cells and tissues.
Colin Nave, Pedro Nunes, Alistair Siebert   +2 more
wiley   +1 more source

Gaining insights into MmpL3: combining structural and computational approaches to unlock transport and inhibitor‐binding mechanisms

Acta Crystallographica Section D, Volume 82, Issue 5, Page 550-570, May 2026.
This study investigates the mycobacterial membrane protein MmpL3, a key target for new antituberculosis drugs, by combining high‐resolution crystallography and computational simulations. It reveals how the inhibitor UPAR‐1109 binds to MmpL3, providing detailed insights into the function and flexibility of the protein and supporting the rational design ...
Satoshi Murakami, Domenico Marson, Eiki Yamashita, Bruno Broshka, Ui Okada, Maho Aoki, Giannamaria Annunziato, Erik Laurini, Emanuele Carosati, Marco Pieroni   +9 more
wiley   +1 more source

Commissioning and validation of the Elekta One GPUMCD algorithm for an Elekta VersaHD linear accelerator

Journal of Applied Clinical Medical Physics, Volume 27, Issue 3, March 2026.
Abstract Purpose The purpose of this work was to commission and validate GPUMCD, a GPU‐accelerated Monte Carlo dose calculation engine for c‐arm Elekta linear accelerators (linac). This algorithm was recently released for clinical implementation in the Elekta One Treatment Planning System (v6.2.3, EOP). Methods A GPUMCD beam model was generated for all
Samuel D. Rusu, Blake R. Smith, Grace H. Hutchinson, Jun Hsuang Jen, Daniel E. Hyer   +4 more
wiley   +1 more source